Swivel hose fitting



Feb. 17, 1942. N, M COUTY 2,273,397

4 I swIvEL HosE FITTING Find April 5, 1941 .......Ar'z wir.;

f ATTORNE:

Patented Feb. 17, 1942 2,273,397 SWIVEL nosa FITTING Norman .M. Couty, Detroit, Mich., assigner to The Flex-O-Tube Company, a corporation of Delaware Application April 5, 1941, Serial No. 386,980

3 Claims.

This invention relatesv to swivel couplings for exible hose and the like.

This invention is an improvement over the invention disclosed and claimed in an application for patent, Serial No. 226,087 filed August 22, 1938,

by Norman M. Couty, the applicant herein, whichV application has matured into U. S. Letters Patent No.'2,172,650 dated September 12, 1939 entitled Male swivel nut connection.l

'I'he prior art includes a fitting of the general type disclosed and claimed herein, however, when a fitting such as disclosed and claimed in thev said Letters Patent No. 2,172,650 is placed under vacuum, initial compression on the compressible gasket employed is relieved, the fluid seal normally obtained is lost, and leakage results.

The primary object of the instant invention is to provide a fluid-tight swivel coupling usable under both pressure and vacuum which will allow hose or tubing to swivel or rotate with respect to the part to which it is coupled.

Another object of the invention is to provide a simple, inexpensive swivel coupling for connecting flexible hose and the like to a relatively throughout the several views, the illustrative embodiment of the invention disclosed `in Fig. 1 comprises a swivel tting generally designated by the numeral I0 which is composed of a malenut II threadable into a part I2 to which the flexible hose or the like I3 is to be connected, the said flexible hose I3 having a coupling member I4 fixed thereon which has a tubular stem I5 extending therefrom through a suitable bore I6 in the male nut II. The tubular stem I5 of the bores Il and |10 accommodating a compressible annular washer or gasket .I8 which has a radial flange extending therefrom which is disposed between the annular face ||0 of the male nut II and the annular face |40 of the said coupling member I4. The annular washer or gasket |8 is slightly longer than the sum of the depth of the two counterbores I`I and |10 and the thickness of the radial flange |80 thereof.

The extreme end |50 of the tubular stem I5 of the coupling member I4 is flared or peened over after assembly to hold the swivel fitting Il) in assembled relationship and to initially compress the said 'compressible annular gasket I8 in the counterbores I1 and |10 and to initially compress the radially extending flange |80 thereof between the annular face ||0 of the male nut I I and the annular face |40 of the coupling member I4. The said initial compression of the said annular gasket I8 and its flanges |80 creates a uid-tight seals-between the coupling member I4 and the male nut II,

Although the hose coupling member I4 is in dicated as employing an inner tubular member 20 within the interiorly threaded swedged shell 2| to prevent collapsing of the flexible hose I3 when the shell 2| of the coupling member I4 is swedged onto the said fiexible hose I3, it is obvious@ that .any type of coupling means other thanthat shown maybe employed to connect the hose I3 to the coupling member I4.

Fluid under pressure within the fluid system to which the swivel fitting I0, the part I2, and the hose or the like I3 belong causes the hose coupling I4 and its tubular stem I5 to move in the direction indicated by the arrow 22 with respect to the male nut II. Pressure on fluid from within thesaid fluid system which might force fluid out through minute space between the uter surface of the tubular stem I5 of the coupling member I4 and the bore I6 through the male nut II will tend to urge the compressible annular gasket I8 out through the space 25 between the annular faces |I0 and |40 of the male nut and coupling member I4 respectively, however, inasmuch as the annular gasket I8 is longer than the said space 25 between the annular faces ||0 and |40 of the male nut II and coupling member I4 respectively, the said annular gasket cannot be forced by pressure out through the said space 25,

' and, -the greater the pressure within the fluid system, the tighter the wedging of the flanged annular gasket AI8 within the counterbores I'I and |10 and the greater the fluid tightness of the fitting.

member I4 respectively.

to squeeze the radial flange |80 of the gasket I8 I therebetween to form a tight seal simultaneously with the further compressing of the annular portion of the said gasket I8 axially which is thereby further expanded radially within the counterbores I1 and I18 in the male nut I I and coupling The more the vacuum within the fluid system, the tighter the squeezing of the flange |80 of the annular gasket I8, the

greater the compression axially on the annular gasket I8, and the greater the fluid tightness of the fitting.

The illustrative embodiment of the invention disclosed inFig. 2 comprises a swivel fitting generally designated by the numeral which is composed of a male nut 3l threadable into a part 32 to which the flexible hose or the like 33 is to be connected, the said exible hose 33y having a coupling member 34 xed thereon which has a tubular stem 35 extending therefrom through a suitable bore 36 in the male nut 3I. 'Ihe tubular stem 35 of the coupling member 34 is sufficiently free within the bore 30 of the male nut 3I to permit the coupling member 34 and the iiexible hose 33( to which it is connected to swivel with respect to the said male nut 3|. The end of the male nut 3l nearest the coupling member 34 is counterbored at 31 and the opposite end of the said male nut 3I is counterbored at 310, both counterbores 31 and 310 accommodating compressible annular washers or gaskets 38 and 3800 respectively, the said gasket 38 having a radially extending ange 380 extending therefrom which is disposed between the annularface 3I0 of the male nut 3l and the annular face 340 of the said coupling lmember 34. The portion of the annular washer or gasket 38 which intoy the counterbore 31 is slightly longer than the depth thereof and the length of the gasket 3800 is slightly longer than the depth of the counterbore 310.

The extreme end 350 of the tubular stem 35 of the coupling member 34 is flared or peened over after assembly to hold the swivel fitting 30 in assembled relationship and to initially cornpress the said compressible annular gaskets 38 and 3800 in the counterbores 31 and 310 respectively and to initially compress the radially extending flange 380 of the gasket 38 between the annular face 3I0 of the male nut 3I and the annular face 340 of the coupling member 34. The said initial compression ofthe said annular gaskets 38 and 3800 and the flanges 380 ofthe gasket 38 creates fluid-tight seals between the coupling member 34 and the male nut 3I.

Although the hose coupling member 34 is, in/-j dicated as employing an innerstubular member 40 within the interiorly threaded swedged shell 4I to prevent collapsing of the flexible hose 33 whenthe shell 4I of the coupling member 34 is swedged onto the said exible hose 33,- it is obvious that any type yof coupling means other than that shown may be employed to connect the hose 33 to the coupling member 34. i

Fluid under pressure within the uid system to which the swivel fitting 30, the part 32, and the hose or the like 33 belong causes the hose coupling 34 and its tubular stem 35 to move in the direction indicated by the arrow 42 Fwith respect to the male nut 3|. Pressure on uid yfrom within the said fluid systemwhich might force iiuid out through minute spaces between the outer surface of the tubular stem 35 of the coupling member 34'and the bore 38 through the male nut 3| will tend to urge the compressible annular gasket 3800 out through the space betweenv the male nut 3| and the peened over portion350 of the stem 35 of'the coupling member 34, however, inasmuch as the annular gasket 3800 is thicker than the space 3500 between the said peened over portion 350 of the coupling member 34 and the male nut 3l, the said annular gasket 3800 cannot be forced by pressure out through the said space 3500, and, the greater the pressure-within the fluid system, the more the movement of the hose coupling 34 and its tubular stem 35 in the direction indicated by the arrow 42 with respect to the male nut 3l and the tighter the `wedgingof the annular gasket 3800 in the counterbore 310, and the ltighter the fluid seal accomplished thereby.

If the pressure within the iiuid system to which the said swivel fitting 30, the part 32 and the hose or the like 33 belong is changed to vacuum, then the hose coupling 34 and its tubular stem 35Vare urged in the direction indicated by the arrow 43 with respect to the male nut 3l. This causesthe annular faces 3I0 and 340 of the male nut 3I and the hose coupling 34 respectively to squeeze the radial ange 388 of the gasket 38 therebetween and form a vtight seal thereat simultaneously with causing the annular portion of the said gasket 38 to be further compressed axially and expanded radially within the counterbore 310 in the male nut 3I. The more the vacuum within the uid system, the greater the squeezing of the flange 380 of ze annular gasket 38, the greater the compression of the annular gasket 38, and the greater the :duid tightness of the tting.

Accordingly, the embodiments of the invention provide simple eiective swivel hose coupling means which have a fluid-tight seal against both pressure and vacuum.

Although but two embodiments of the invention have been disclosed and described herein, it is obvious that many changes in the size, shape, arrangement and detail of the various elements thereof may be made without departing from the spirit and scope of the invention as dened by the appended claims.

I claim:

l. In a swivel coupling including a, coupling member having a tubular stem, a nut having an axial bore therein telescoped over said tubular stem, said nut having a counterbore in the end thereof adjacent the coupling member, said coupling member and said nut having oppositely disposed annular faces, an annular radially 'flanged gasket disposed in said counterbore and having its radial flange extending between said annular faces, the annular portion of said gasket being slightly longer than the depth of the counterbore in said nut, and means for holding said nut and annular radially anged gasket in assembled relationship with respect to said coupling member simultaneously with initial deformation of said annular gasket within said counterbore.

2. In a swivel coupling including a coupling member having a tubular stem, a nut having an axial bore therein telescoped over said tubular stem; said nut having a counterbore in the end thereof adjacent the coupling member, the said coupling member having an annular counterbore therein axially opposite the counterbore in said nut, said coupling member and saidnut having oppositely disposed annular faces, an annular gasket having a radial flange located inward of the ends .thereof disposed in sa'id counterbore and having its radial flange extending between said annular faces, the annular portions of said gasket being slightly longer than the depth of the counterbores in said nut and said coupling member, and means for holding said nut and annular radially flanged gasket in assembled relationship with respect to said coupling member simultaneously with initial deformation of vsaid annular gasket within said counterbore,

3. In a swivel coupling including a coupling member having a tubular stem, a nut having an axial bore therein telescoped over said tubular stem, the said nut having counterbores therein at both ends thereof, said coupling member and said nut having oppositely disposed annular faces, an annular radially flanged gasket disposed in the counterbore adjacent the annular face of said coupling member and an annular gasket disposed in the other counterbore, the annular portion of the flanged gasket being slightly longer than the depth of the counterbore adjacent the annular face of said coupling member and the other gasket being slightly longer than the depth of the other counterbore, and means for holding said coupling member, said nut and said gaskets in assembled relationship simultaneously with initial deformation of said gaskets within said counterbores.

' NORMAN M. COUTY. 

